Pulley.



No. 867,498. PATENTED OCT. 1, 1907.

H. J. GILBERT.

PULLEY.

APPLICATION FILED JULY 6,1903.

M /%/M7 gymlmm ,B f fi 15M HENRY J. GILBERT, OF SAGINAW, MICHIGAN.

PULLEY.

To all whom it may concern."

Be it known that I, HENRY J. GILBERT, a citizen of the United States, residing at Saginaw, in the county of Saginaw, in the State of Michigan, have invented certain new and'useful Improvements in Pulleys, of which the following is a description, reference being had to the accompanying drawings, forming part of this specification.

While my invention primarily relates to pulleys, and more particularly to pulleys of small size but having relatively large shaft openings, it may also be utilized for other purposes, "such as shaft couplings, as herein after explained.

It has for its object the construction of a simple, cheap and eflicient structure of this character from sheet metal;

In the accompanying drawings, Figure 1 is a side elevation of a pulley embodying my invention, in the position shown in Fig. 2, with a portion of one end cut away to expose the interior thereof; Fig. 2 a cross-section on thelihe 2-2 of Fig. 1; Fig. 3 a perspective view of one half of the inner shell of the pulley; and Fig. 4 a detail of Fig. 3 showing a key-way.

The same letters .of reference are employed to indicate corresponding parts inthe several views.

' My novel pulley is preferably composed 'of a two-part outer shell or cylinder A having inturned flanges a at its opposite ends, and a two-part inner shell or cylinder of .which the two halves of the pulley are secured together and clamped upon the shaft, the outer shell A of the pulley is-provided on each side of the pulley with four angular indentations c of the shape shown, whose surfaces parallel with the dividing line of the pulley form hearing or clamping surfaces for the heads and nuts of the-'bolts C, the latter in the present instance being provided with nicked heads and nuts to permit the employment of a screw driver instead of a wrench. The indentations c are formed in the shell A by suitable dies for the purpose. a

To accommodate the inner corners d of the indentations c the inner shell or cylinder B is provided with forming supports or saddles f projecting under the clamp- I ing or bearing surfaces formed by the indentations c in the outer shell A, as shown in Fig. 2. The two halves of the inner shell B areslightly less than half circles, so that when applied to the shaft their inner edges remain Specification of Letters Patent.

Application filed {sly (i, 1903. Serial No. 1641,436-vv Patented Oct. 1, i907.

slightly separated. for clamping purposes,'as is also true of the inner edges of the two halves of the outer shell or cylinder A; and it results from the provision of the supporting saddlesf that the strain of the clamping bolts is applied directly to the saddles f so that the inner shell or cylinder, of which said saddles form a part, is directly and securely gripped to the shaft with the full power of the bolts.

edge of the opposing half of the shell. Four of these lugs are arranged immediately within the end flanges a of the shell A, as indicated in Fig. 1, so that their engagement with said end flanges prevents longitudinal displacement of the two halvesof the pulley relativelyto each other, while their engagement with the edges of the cylindrical portions of the shell prevents lateral. displacement.

Instead of the lugs 9, continuous flanges along the meeting edges of the outer shell maybe employed, said flanges being either formed integral with the shell,

as are the lugs g, or composed of separate strips of sheet metal secured to the edges of the shell.

Some of the advantages of my invention may be utilized in a pulley comprising simply the twonpart outer shell A having the end flanges a and the inden tations c, and the bolts C having their heads and nuts bearing upon'the clamping surfaces of said indentations, either with or without the employment of the lugs g; but the pulley is strengthened and its efn'ciency increased by the employment of the two part inner cylinder B provided with the supporting saddles f for the clamping surfaces of the outer shell, and also given a larger and more secure bearing upon the shaft.

Where the outer shell alone is employed the indentaward of the metal to form the supports f in such case l but it is often a desideratum in small sized pulleys to be able to provide as large a shaft opening as possible relative to the outside diameter of the pulley, and the provision of the openings e, accommodating the inner corners of the indentations 0, permits this purpose to be accomplished to a maximum degree.

As will be understood from the foregoing description of my invention as embodied in a pulley, it may be readily utilized in shaft couplings. The exact structure which has been illustrated and described as a pulley may be used as such a coupling, and a key-way be provided in it as in Fig. 4 if it is desired to key the coupling to the shaft instead of employing it as a friction coupling. The two-part outer shell A and clamping bolts may likewise be employed as a coupling independent of the inner shell B, in which event a twopart thimble or bushing would be inserted within the coupling in lieu of the innenshell in order to give the necessary bearing for the coupling upon the ends of the shafts.

Where the complete structure which I have illustratedand-described is employed as a coupling it may be utilized to couple together shafts of different sizes, by employing bushings of difierent thicknesses between the coupling and the respective shafts.

Having thus fully described my invention, I claim:

1. The herein described sheet metal structure for pulleys and the like, comprising the two-part outer shell A having the end flanges a and the indentations a forming the clamping surfaces for the bolts, and the bolts C; substantially as described.

2. The herein described sheet metal structure for pul leys and the. like, comprising the two-part outer shell A having the end flanges a and the indentations c forming the clamping surfaces for the bolts, and provided along the meeting edges of the shell with interlocking projections and the bolts C; substantially as described.

3. The herein described sheet metal structure for pulleys and the like, comprising the two-part outer shell A having the end flanges a and indentations c forming the clamping surfaces for 'the,bolts,-and provided with the lugsg and the bolts C; substantially as described.

4. The herein-descrlbed sheet metal structure for pul leys and the like, comprising the two-part'outer shell A having the end flanges a and indentations c forming the clamping surfaces for the bolts, the two-part inner shell B provided with the supporting saddles f projecting beneath the clamping surfaces of the outer shell, and the bolts C for uniting the two halves of the pulleys; substantially as described. I

5. The herein described sheet metal structure for pulleys and the like, comprising thetwo-part outer shell A having the end flanges a and indentations c and provided along the meeting edges of the shell with interlocking projections, the two-partinner shell B provided with the supporting saddles f for the clamping surfaces formed by the indentations c, and the bolts C substantially as described.

6. The herein described sheet metal structure for-pul- .leys and the like, comprising the two-part outer shell A having the end flanges a and indentations c and provided along the meeting edges of the shell with the lugs g, the two-part inner shell B provided with the supporting saddles f for. the clamping surfaces formed by the lndentatious c; and the bolts C substantially as described.

. 7. The herein described sheet metal structure for pulleys and the like, comprising the two-part outer shell A havlng the end flanges a and indentations 0 forming clamp- $ng"surfaces for the clamping bolts, the two-part inner shell I) having the openings 6 'to accommodate the inner somes corners of the indentations c in the outer shell and provided with the supporting saddles f for the clamping surfaces, and the bolts C; substantially as described.

8. A sheet metal pulley comprising the two-part outcr ,shell A having the end flanges a and indentations c and .provided along the meeting edges of its halves with the lugs g, the two-part innershell B having the openings 0 to accommodatethe inner corners of the indentations and provided with the supporting saddles f for the clamping substantially as described.

9. The herein described pulley comprising a twopart outer shell having marginal flanges a inwardly directed towards the shaft opening and adjacent thereto, and means for clamping the parts of the shell; substantially as dcscribed.

10. The herein described pulley comprising a two-part outer shell having marginal flanges a inwardly directed towards the shaft opening and also having interlocking edges, and means for clamping the parts of the shell substantially as described.

11. The herein described pulley comprising a two-part outer shell -A having flanges a inwardly directed towards the shaft opening, a two-part inner shell arranged within the outer shell, and means for clamping suid shells; substantially as described.

12. The herein described pulley comprising a two-part outer shell A having flanges a, a two-part inner shell arranged within the outer shell and in contact with said flanges, said outer shell having indentations forming clamping surfaces for the bolts, and bolts for clamping said parts together; substantially as described.

13. The herein described pulley comprising a two-part outer shell A having flanges a, a two-part inner shell upon which the outer shell is saddled and arranged concentric therewith, and means for clamping the parts of the shells; substantially as described.

14. The herein described pulley comprising a two-part outer shell A having flanges a and also having along the nieetingv edges ears or lugs g alternately arranged upon the opposite halves of the pulley and each fitting within the edge of the opposing half of the shell, and means for clamping the parts of the shell substantially as dcscrlbcd.

15. A pulley comprising a two-part outer shell and a two-part inner shell, means for supporting said shells in concentric relationjand means for clamping the parts of the shell; substantially as described.

16. A pulley comprising a two-part outer shell and a two-part inner shell, one of said shells having flanges for spacing the two shells; substantially as described.

'17. A pulley comprising a two-part outer shell and a two-part inner shell, means for supporting said shclls in concentricrelatlon, and clamping bolts passing through and engaging the parts of the outer shell for clamping to gether the parts of said shell and for also clamping to- HENRY .T. GILBERT. Witnesses EDWARD Rnc'ron,

LOUIS B. EBWXN.

gether the outer and inner shell substantially as described.

surfaces formed by said indentations, and the bolts C; 

